物质匮乏也不是决定性的因素；
物质匮乏的时候只能买二两花生，瓜子和水果糖。
In the days of material scarcity, we could only afford to buy 100 grams of peanuts, some sunflower seeds and some fruit candies.
它们在没有明显物质匮乏、生存物品有保障的人群中出现。
They arise in populations that do not have significant material-scarcity problems with survival goods.
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